These were in a Audi if I remember correctly. They used 3 mounting points which I'm not used to, but install came out real clean.

I always use the OEM holes since they're much better than simply drilling a hole in the floor and running a bolt with washer that could easily pull through in the case of a bad Taco curse situation. (crash) Just thought I'd share.
Front mount. I welded a plate with a tab to the floor.